Previously sailed only on RCI Liberty of Seas, also from Galveston, Thanksgiving 2017.
This was a last-second purchase for Spring Break. Only place we could get 2 rooms was the spa deck. We got one balcony and the one oddball interior room and had to split our adults across the two rooms to make the booking legal. (My wife and I are 50 and 47, son is 15, daughter is 9).
Drove down from Austin. Embarkation was very smooth and quick. Muster drill boring but fine. I had the carnival Hub app, and used it; wife and son had it but never used it; daughter didn't have a device.
(I don't know which category under Cloud 9 Spa Balcony it was).
Balcony was neat but ended up not spending much time out there due to bad weather on first sea day. Bed was comfortable; shower had good pressure; couch was OK; pretty much met expectations for a decent balcony room. They give you nicer towels (nice) and some special toiletries (didn't care).